METHOD FOR ASSESSING THE STATE OF THE MEASURING SYSTEM OF A CORIOLIS FLOW METER Russian patent published in 2022 - IPC G01F1/66 G01F1/84 G01F25/00 

FIELD: measuring equipment.

SUBSTANCE: area of application: invention relates to an apparatus for measuring the mass flow rate of liquids and gases, namely to Coriolis flow meters, and relates to diagnostics and methods for verification of a Coriolis flow meter. Substance: in a method for assessing the measuring quality of a Coriolis flow meter, including exciting mechanical oscillations of the oscillatory system, measuring the oscillations of the mechanical system by means of at least one oscillation sensor, and assessing the parameters of the oscillatory system based on the measured oscillations and a numerical model of the oscillatory system, according to the invention, the numerical model of the oscillatory system constitutes a system of equations, e.g., differential equations based on the measured normal shapes, frequencies and coefficients of the numerical model of the oscillatory system found from the calibration results, the measure of deviation of the parameters of the oscillatory system from the initial state for the set of normal shapes of the oscillatory system is calculated, based on the resulting measure, an assessment of the quality of measurement results of the Coriolis flow meter is calculated. The magnitudes of normal shapes, frequencies and rigidity, mass and damping matrices of the oscillatory system found from calibration are used as coefficients of the numerical model of the oscillatory system. The coefficients of the model are functions of temperature, pressure, density of the measured medium, the ambient temperature. A vector magnitude, the components whereof are calculated as the product of the degree of normal frequency on the corresponding normal shape on the vector obtained from the calibration results, or the sum of the products of the degrees of normal frequency on the corresponding normal shape on the vectors obtained from the calibration results, is taken as a measure of deviation of the parameters of the oscillatory system from the initial state. To assess the measure of deviation of the parameters of the oscillatory system from the initial state, part of the coefficients of the model are considered insignificant and are taken to be equal to zero. The matrices and vectors, by reason of simplicity of the model of the oscillatory system, have same-magnitude elements and can be reduced to a single scalar value. The normal shapes and frequencies are not determined in calibration, but calculated from the matrices of measures of rigidity, inertia and damping, found from the calibration results.

EFFECT: more reliable detection of change in the calibration coefficient of the flow meter, associated with the mass flow rate and density, and, therefore, improved diagnostics of the state of the measuring system of the flow meter, eliminated dependence on the method for assessing the parameters of the oscillatory system.

9 cl, 8 dwg